I took the Mexican Riviera cruise on Bliss this past January. When we got to Puerto Vallarta, they didn't change the ship time, even though it was different from Port time. They announced this a number of times. Even if people missed the announcement, it wouldn't have mattered, because they just would have gotten back to the ship earlier than they needed to.
So, in your situation, my prediction is that it will be 7 AM ship time. But you never know.